Littelfuse 777-MV-P2 - The 777-MV-P2 three-phase current and voltage monitor provides motor protection with input voltage from 100–240 V ac and motor full load ampere range of 10–800 A (external CTs required).
Littelfuse

777-MV-P2

Alternate Item Number: 777-MV-P2

UPC: 079458991093

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Overview

The Littelfuse 777-MV-P2 is a robust three-phase current and voltage monitor engineered for comprehensive motor protection in industrial settings. This unit safeguards motors against critical electrical faults including overcurrent, undervoltage, phase loss, and voltage/current unbalance. It supports a wide line voltage range of 200-480V AC at 50/60Hz and accommodates motor full load ampere ranges from 2-800A, with external CTs required for currents exceeding 90A. The 777-MV-P2 features a built-in 3-digit LED display for real-time monitoring of voltage, current, kilowatts, and horsepower, along with diagnostic fault codes for efficient troubleshooting. Users benefit from programmable voltage and current settings, offering flexibility across various systems. Three selectable restart options (automatic, semi-automatic, manual) and three programmable restart delay timers allow for tailored protection strategies, including rapid cycle protection, motor cool-down, and dry-well recovery. Enhance operational visibility and safety with remote display compatibility, enabling monitoring without opening cabinets, which aids in arc flash safety compliance. Reset functionality is flexible, supporting both the built-in pushbutton and optional remote reset kits (777-MRSW or OL-RESET). For advanced integration, optional communication modules (Modbus, DeviceNet™, Profibus, or Ethernet) enable remote monitoring and control of up to 99 units via PC, PLC, or SCADA systems using Littelfuse Solutions software. Constructed for reliability in demanding conditions, the 777-MV-P2 operates within an ambient temperature range of -40°C to 70°C and boasts IP20/NEMA 1 protection. It meets stringent industry standards including UL508, UL1053, CE, and CSA certifications. Ideal for applications with non-linear motor load characteristics, such as small or slow-speed motors, and larger motors operating at light loads, this monitor is crucial for manufacturing plants, water treatment facilities, HVAC systems, and conveyor motors. The compact dimensions are H: 77.47 mm (3.05”), W: 97.79 mm (3.85”), D: 128.27 mm (5.05”).
  • Comprehensive 3-phase motor protection against overcurrent, undervoltage, phase loss, and unbalance.
  • Wide operating voltage range (200-480V AC) and motor FLA range (2-800A with external CTs).
  • Built-in 3-digit LED display for real-time monitoring and diagnostic fault codes.
  • Programmable voltage/current settings, 3 restart options, and 3 restart delay timers.
  • Optional communication modules for Modbus, DeviceNet™, Profibus, Ethernet integration.

Specifications

Brand Name
Littelfuse
Current Rating
10-800 A
Current Rating
10–800 A
Frequency
50/60 Hz
IP Rating
IP20
Nema Rating
NEMA 1
Operating Temperature
-4 to 158
Operating Temperature, Maximum
158
Operating Temperature, Minimum
-4
Series
777-MV
Size
77.47mm H x 97.79mm W x 128.27mm D
Special Features
5YR WARR
Standard
UL/CE
Sub Brand
Symcom
Voltage Rating
100-240 V
Package Dimensions (L x W x H)
5.05 IN x 3.85 IN x 3.05 IN
Package Dimensions (L x W x H)
128.3 mm x 97.8 mm x 77.5 mm
The 777-HVR-P2 three-phase current and voltage monitor provides motor protection with input voltage from 340–480 V ac and full load ampere range as follows: 2–20 A (looped conductors required); 20–90 A (direct); 90–800 A (external CTs required).

777-HVR-P2

The 777-HVR-P2 three-phase current and voltage monitor provides motor protection with input voltage from 340–480 V ac and full load ampere range as follows: 2–20 A (looped conductors required); 20–90 A (direct); 90–800 A (external CTs required).
Three Phase Monitor Relay; DIN-Mount; 190-500V; 10A DPDT; Phase Loss; Reversal; Unbalance; Under/Over Voltage

PMDU

Three Phase Monitor Relay; DIN-Mount; 190-500V; 10A DPDT; Phase Loss; Reversal; Unbalance; Under/Over Voltage
CM-PVE UNDER & OVERVOLT. 3PH.

1SVR550871R9500

CM-PVE UNDER & OVERVOLT. 3PH.

Frequently Asked Questions about Littelfuse

What certifications and standards do Littelfuse products comply with?

Littelfuse products are certified to multiple international standards, including UL (Underwriters Laboratories), CSA (Canadian Standards Association), CCC (China Compulsory Certification), and EAC (Eurasian Conformity). Customers can verify specific product certifications by consulting individual product datasheets on Littelfuse.com, which provide comprehensive details about standards compliance for each component.

What industries and applications are Littelfuse products used for?

Littelfuse products are critical for electrical protection and safety across multiple industrial sectors, including manufacturing, automation, power distribution, and electrical control systems. Their comprehensive product portfolio serves industries that require robust electrical protection, including motor and pump applications, solar installations, programmable logic controllers (PLCs), electrical switch panels, and critical infrastructure environments. Key product lines protect against overcurrent, voltage transients, ground faults, and temperature-related electrical risks, ensuring equipment safety and operational reliability.

What technical support does Littelfuse offer?

Littelfuse offers comprehensive technical support through multiple channels. Their Technical Hotline (800-TEC-FUSE) provides direct access to engineers who can help identify issues and recommend solutions. Additionally, Littelfuse offers extensive online Technical Resources at Littelfuse.com, including datasheets, product manuals, whitepapers, application guides, and online design tools. Their experienced product and application engineers also provide step-by-step support from design to installation.

What are the main product lines offered by Littelfuse?

Littelfuse offers comprehensive industrial protection and control product lines, including fuses, fuse holders, protection relays, temperature sensors, and electrical safety components. Their key product categories span surge protective devices, custom OEM products, electrical switch panels, medium voltage fuses, ground-fault protection relays, motor and pump protection devices, and temperature sensors. These products are designed to minimize electrical safety hazards, limit equipment damage, improve productivity, and safeguard personnel from electrical faults.

What are the key features of Littelfuse products?

Littelfuse products feature exceptional circuit protection technologies with key characteristics including UL/IEC safety standard compliance, low internal resistance, and advanced protective capabilities across multiple product lines. Their components provide critical protection for industrial systems, offering features like overcurrent protection, voltage transient suppression, and resettable protection devices with ultra-low resistance and compact designs. Key product lines include fuses, metal oxide varistors (MOVs), TVS diodes, PolySwitch devices, and specialized electronic protection components that enhance system reliability and safety.

What environmental ratings do Littelfuse products have?

Littelfuse products feature comprehensive environmental ratings, including NEMA Type 1, 2, 3, 3R, 4/4X, 12, and 13 certifications, as well as IP65 protection. These ratings ensure superior protection in diverse industrial environments, with an operating temperature range of -40°F to +131°F (-40°C to +55°C). Many products also include UV-stabilized materials and neoprene gaskets for enhanced durability in outdoor and challenging conditions.

What accessories are available for Littelfuse products?

Littelfuse offers several key accessories across their product lines, including fuse holders, voltage monitoring modules, and terminal connectors. Specific accessories include the LPSM003ZXID (indicating) and LPSM003Z (non-indicating) POWR-SAFE Dead Front fuse holders for Class CC and Midget-Style fuses, the VRM6048 voltage monitor accessory module, and female quick connect terminals (P1015 series) in various wire gauge sizes. These accessories are designed to enhance protection, monitoring, and connectivity for Littelfuse electrical components.

What is Littelfuse's warranty policy?

Littelfuse provides comprehensive warranty details on their official website at www.littelfuse.com/warranty. Customers should visit this page to review the specific warranty terms and conditions for their specific product lines. For direct warranty support or questions, customers can contact Littelfuse Technical Support at 1-800-TEC-FUSE or email [email protected].

What communication protocols do Littelfuse products support?

Littelfuse supports a comprehensive range of industrial communication protocols, including PROFIBUS, PROFINET, EtherNet/IP, DeviceNet, Modbus RTU, and CANopen. Our products provide flexible connectivity solutions across multiple industrial automation platforms, enabling seamless integration with various control systems and network architectures.

How are Littelfuse products typically installed?

Littelfuse products are typically installed using specialized mounting hardware like fuse holders, blocks, and panels designed for specific industrial applications. The POWR-SAFE Dead Front holders, for example, provide optimum protection for Class CC and Midget-Style fuses, supporting installations up to 600 VAC/DC. Installation often involves using precision terminals with strain relief, such as 0.25 in. female quick connect terminals, to ensure secure and safe electrical connections in industrial control systems.